Head and column clamp interlock



July 24, 1934.

D. C. KLAUSMEYER ET AL HEAD AND COLUMN CLAMP INTERLOCK Filed July 7, 1931 4 Sheets-Sheet l amoentozs DA W0 6. KLAMJMEYER DECEASED 8) H flf/vkmuggfmxfl a M 50.04

July 24, 1934.

D. C KLAUSMEYER El AL 1,967,409

HEAD AND COLUMN CLAMP INTERLOCK Filed July 7, 1931 4 Sheets-Sheet 2 D. c. KLAUSMEYER ET AL LQWALQ HEAD AND COLUMN CLAMP INTERLOCK Filed July 7, 1931 4 SheeitS-Sheei; 3

, ma i I July 24, 1934. C KLAUSMEYER AL 1,967,409

HEAD AND COLUMN CLAMP INTERLOCK Filed July 7, 1951 4 Sheets-Sheet 4 awvemtozs 0/4 W C. KLAUJMEYER Patented July 24, 1934 UNITED STATES HEAD AND COLUMN CLAMP INTERLOCK David C. Klausmeyer, deceased, late of Cincin nati, Ohio, by H. Henry Sundermann, executor, and Augustus M. Sosa, Cincinnati, Ohio, assignors to The Cincinnati Bickford Tool Com pany, Cincinnati, Ohio, a corporation of Ohio Application July 7, 1931, Serial No. 549,256

7 Claims.

This invention concerns drilling machines, and. more particularly is related to column and head clamping mechanisms for radial drills.

Machine tools of this character customarily combine an upright column, a sleeve member rotatably mounted thereon, a laterally projecting radial arm adjustable vertically upon the sleeve, and a tool head or saddle translatable upon the arm and which supports the tool or tools as the case may be. Power for driving the tool is provided by a motor or other prime mover, preferably carried by the drill arm, and which is transmitted through suitable change gear mechanisms and shafting to the drill spindle.

To spot, or position the tool with respect to the work-piece, it is customary for the operator to elevate or lower the radial armaccording to the size or position of the work-piece, and also to swing it angularly about the column to the proper position, and finally, to adjust the position of the A tool head radially upon the arm until the tool is located directly over the work-piece and at the exact position required.

In the interests of accuracy and precision, so essential to modern manufacturing, it is very important that, after spotting the drill, the column, radial arm and tool head be rigidly clamped in theiradjusted positions during thetooling operation. Heretofore no adequate means have been provided whereby the column and head could be clamped simultaneously, and/or by the operation of but a single control lever. Previously it has been necessary to clamp these members separately, with a consequent loss of operating time and not infrequently, operators inadvertently neglect to operate one or more of the clamping means and consequently the machine lacks rigidity and inferior and inaccurate work-pieces are produced.

To overcome these diificulties, this invention. has for its primary object, to provide clamping means for all of the relatively movable elements and an interlocking mechanism between the column and head clamping mechanisms, whereby the actuation of a single lever serves simultaneously to clamp or unclamp both the head and column thereby insuring rigidity of machine and accuracy in the work performed thereby.

However, should the operator desire or should the natureof the work demand, that the arm be and remain clamped in a predetermined angular position, as for example, for straight line drilling operations, this invention further proposes a means for permitting selective operation of the head clamping mechanism independently of the column clamping means. Thus, it will be perceived that the operator need not disturb the angular position of the arm between the successive tooling operations performed on one or more work-pieces thereby producing uniform accuracy in the finished work with .but aminimum outlay of time.

A still further object is to increase the operating efficiency by arranging all control levers including the dual purpose lever described, the auxiliary head clamping lever, and also an arm clamping control lever for clamping the radial arm to the sleeve, upon the movable tool head and within convenient reach of the operator when the latter is in his normal working position before the spindle. A

These and other objects of this invention have been accomplished by providing an interlock between the head and column clamping mechanisms and arranged in. a manner whereby the interlocking feature is rendered ineffective upon the independent operation of the, auxiliary head clamping lever irrespective of the position of the column clamping means.

- Other objects and advantages will be in part indicated in the following description. and in part rendered apparent therefrom in connection with the annexed drawings.

To enable others skilled in the art so fullyto apprehend the underlying features hereof that they may embody the same in the various ways contemplated by this invention, drawings depicting a preferred typical construction have been annexed as a part of this disclosure and, in such drawings, like characters of reference denote corresponding parts throughout all the views, of which:--

Figure 1 is a side elevation of a radial drill embodying the present invention. Fig. 2 is anonlarged plan view of a portion of the radial arm.

and connecting parts, partly in section, showing particularly the head clamping mechanism. Fig. 3 is a rear view, partly broken away, of a portion of the column showing the column and arm clamping mechanism. Fig. 4 isa detail elevation along the line 4-4 of Fig. 1, showing particularly the interlock connection between the head and I column clamping mechanism. Fig. 5 is a section substantially along the line 5-5 of Fig. 3.

Referring .more particularly to the drawings, the invention is disclosed as embodied in a radial drilling machine comprising. a standard 1 supporting an upright post 2 upon which a sleeve 3 is rotatably journaled. A radial arm 4.translatably mounted upon the sleeve carries a translatable tool head 6 in which is mounted a rotatable and vertically adjustable tool spindle '7. Although this invention is not concerned with the means to effect vertical movement of the radial arm, or to rotate the tool spindle, a brief description thereof will be given. The power for driving the spindle is derived from a motor 8, preferably mounted upon the rear end of the arm, as shown in Fig. 1, which passes through a conventional transmission mechanism mounted in the arm to an arm shaft 11 and thence by way. of the bevel gears 15 and shaft 14 to the change speed mechanism carried by the tool head. Power forelevating the arm is taken from the main drive train and actuates a nut (not shown) that cooperates with the screw shaft 9. The tool head is slidably mounted upon guideways 16 and 17 of the radial arm and is translated therealong by means of a rack 18 fixed upon the arm and a pinion 19 supported by the head and which latter is rotated by a hand wheel 21.

The mechanism for clamping the radial arm is designated generally by A, and although no further description thereof is deemed necessary, it is to be appreciated that it operates in conjunction with the column and head clamping mechanisms to effect the before mentioned rigidity essential to accurate drilling.

The sleeve 3, in its unclamped position, is normally free to rotate about the post 2, the Weight of the sleeve being transmitted to the post, through the cap 10 in a manner permitting a slight endwise movement thereof so as to lessen the friction between the surface 22 of the sleeve and the surface 23 of the post, as will be seen from the following description.

Means for effecting clamping of the sleeve to the post consists of a split ring 24 having sections 26 and 2'7 joined together by suitable links 28, as shown in Fig. 5. The ring has an internal V- shaped groove 29, adapted to engage conversely flaring surfaces 31 and 32 provided respectively by flange 33 of the sleeve and platform 34 of the post. The ring 24 is contracted, to effect clamping action, by a draw-bolt 36 having an eye 3'7 in which is fitted an eccentric portion or cam 38 of a vertical shaft 39. The draw-bolt 36 passes through an aperture in the ring section 26 and carries an adjusting nut 41 at the end opposite the eye. To actuate the clamp, the eccentric portion 38 of the shaft 39 is adapted to be oscillated by means of a column clamping hand lever 42 fixed upon a sleeve member 42 that journals a stub shaft 43 supported in bearings provided by the tool head, see Figs. 2, 3 and 4. Secured upon the sleeve member 42 is a pinion 46 in mesh with rack teeth 47 formed upon a bar 48 slidably mounted within the tool head transversely of the arm shaft 11, the underside of the opposite end of the bar 48 is provided with another set of rack teeth 49 which mesh with a pinion 51 splined upon a shaft 52 journaled lengthwise of the radial arm. Referring particularly to Fig. 2, it will be noted that fixed upon the shaft 52 is a pinion 53 meshing with the rack teeth 54 formed upon the underside of a bar 56. The rack bar 56 is slidably mounted in a portion of the radial arm, preferably within a bracket 5'7 secured thereto, and is provided adjacent its forward end, with a second set of .rack teeth 58 which mesh with a segmental pinion 59 splined upon the shaft 39. The gear segment 59 is mounted as to move with the arm and transmits the movements of the rack bar 56 to the shaft 39 in any vertical position of the arm.

With the lever in the position illustrated in Fig. 2 the sleeve is unclamped from the post, that is shafts 52 and 39 and cam 38 have been rotated so as to permit the draw-bolt 36 to move relative to the split ring 26 as the latter expands. As the ring expands the inclined bearing portions 26 thereof fall away from the inclined portions 31 and 32 of the sleeve and post and the two members are free to move relative to each other. To effect a clamping of the sleeve to the post, the lever 42 is moved to the position shown in Fig. 1, and the order of movement of the parts is reversed, the cam surfaces 26 engaging the inclined surfaces 31 and 32 so as to bring the surfaces 22 and 23 firmly into engagement.

The principal clamping member for rigidly securing the tool carrier to the radial arm consists of a shaft 61 journaled in bearings in the head 6 and extending horizontally through the rear portions thereof. Referring to Fig. 2, the shaft 61 is provided with eccentric portions 62 and 63 which actuate draw-bolts or eye-bolts 64. These clamp bolts pass through apertures 66, formed at either side of the housing, and into a strap 67 which is fulcrurned at 67 Thus as the clamp bolts are drawn inwardly the upper head guide 16 is gripped between the head 6 and the lower portions of the strap 67 thereby locking the head securely to the arm in any pre- The upper end of the link '73 is slidably mounted within guideways formed in a bracket '74 secured to the tool head and provided with a groove '76 adapted for engagement with a roller or pin '77 mounted upon a lever '78 also secured upon the shaft 61. To clamp the tool head rigidly to the radial arm by means of the lever 42 the operator raises the latter thereby elevating the interlocking link '73 and causing groove '76 to engage the roller '77. Further movement of the link 73 turns the lever '78, shaft 61 and the eccentric portions 62 and 63 thereof, to effect a clamping of the head to the arm. So that a proper engagement of the groove '76 and roller '77 will be insured, a spring pressed roller 78 is mounted upon a roller arm slidable within a bracket 78 secured upon the drill head and exerts a force against the link '73, along a portion 81 thereof, particularly While the groove '76 is in operative connection with the roller '77.

Conversely, to unclamp the tool head, the operator lowers the lever 42 and the reverse operation results; i. e., the interlocking link '73 is moved downward and the groove '76 carries the roller '77 with it, causing the lever '78 to turn the shaft 61 in the opposite direction, thereby releasing the draw-bolts 64. It is apparent, therefore, that the operation of this one lever simultaneously clamps or unclanips both the column and the tool head thereby insuring that the head is clamped whenever the column is clamped, unless the head clamping mechanism tion independently and without disturbing the 1 position of the arm andto this. end the auxiliary 73 is in the clamped or unclamped position. It

will be observed thatwhen the clamping lever 42 is depressed, as shown in Fig. 4, all of the membersuare unclamped and theinterlock 73 has been lowered to a position whereinthe roller '77 is no longer engagedxwith the groove 76, and

. since the cut-away portion 83 now lies adjacent its the pin '7'! it offers no interference when the latter is moved by the auxiliary lever 82. In like manner, when the lever 42 is elevated, effecting a clamped position of the members, the

interlock 73 is elevated sufliciently to disengage the roller 7'? from the groove 76, and due to the location of other cut-away portion 84 of the link, the lever 78 is likewise again free to turn without interference. no tendency of the spring pressed roller 78 to interfere with the disengagement of the roller and groove whenever the interlock is elevated or lowered, a suitable pin or roller 86 is secured within the bracket '74, adapted to engage cam surfaces 87 and 88 of the cut-away portion 83, and thereby cause the link '73 to move laterally against the force of the spring pressed roller 78 and thereby positively disengage the pin 77 from the slot 76.

From the foregoing it will be apparent that this invention provides an efficient and simple mechanism, whereby the tool head and column clamping means may be simultaneously operated from the operators normal working position by a single control lever, and whereby the head clamp may be operated independently and irrespective of the clamped or unclamped position of the column clamping mechanism.

Without further analysis, the foregoing will so fully reveal the gist of this invention that others can, by applying current knowledge, readily adapt it for various utilizations by retaining one or more of the features that, from the standpoint of the prior art, fairly constitute essential characteristics of either the generic or specific aspects of this invention and, therefore, such adaptations should be, and are intended to be, comprehended within the meaning and range of equivalency of the following claims.

Having thus revealed this invention, we claim as new and desire to secure the following combinations and elements, or equivalents thereof, by Letters Patent of United States:-

i. A radial drill combining a column; an arm mounted thereon; a tool-head on said arm; means including a manually actuable lever carried by said tool-head for clamping said arm to said column; means including a manually rotatable shaft journaled in said tool-head and clamp devices actuated thereby for clamping said toolhead to said arm; a first member, carried by said shaft; a second member adapted to be actuated by said arm-clamping lever; a normally-disengaged operative connection between said members; means made operative by the shifting of said arm-clamping lever to render said connection effective thereby to effect rotation of said head-clamp shaft by the movement of the armclamping lever; and a second lever carried by said tool-head for actuating said rotatable shaft independently of said arm clamping lever.

To insure that there will be.

2. A radial drill combining a column; anarm rotatably mounted on said column; a tool-head on said arm; means including a manually actuable lever carried by said tool-head to clamp said arm to said column; means including a manually rotatable shaft journaled in said tool-head and clamp devices actuated thereby for clamping said tool-head to said arm; a member connected with said arm-clamping lever and adapted to be actuated thereby; an arm connected with said shaft; a disconnectible connection between said member and said arm adapted to effect setting of said head-clamp by the setting of said arm-clamp but permitting actuation of said head-clamp without effecting said arm-clamp; and a second lever carried by said tool-head for actuating said head clamp. i

3. In a machine tool having a support, a member mounted thereon and an element translatably mounted on said member, a first clamp device for clamping said element to said member; a second clamp device for clamping said member to said support; individual actuating means for said first clamp device; a second clamp actuating means common to both of said clamp devices including a lever, a member permanently connected with said lever and having a normally inoperative connection with said first clamp actuator; means operative by the initial clamp closing movement of said lever to establish an operative connection between said first and second clamp actuators thereby to cause them to be operated simultaneously; and means operative at the final unclamping movement of said lever to break said operative connection thereafter to permit said first clamp device to be operated independently of the sec- 0nd.

4:. In a radial drill having a support, an arm supported thereby and a tool-head mounted on said arm, means including a manually actuable.

lever carried by said tool-head, a gear rotated thereby and a slide-bar actuated by said gear for clamping said arm to said support; means including a manually rotatable shaft journaled in said tool-head and clamp devices actuated thereby for clamping said head to said arm; means adapted to connect said lever with said shaft thereby to cause said head clamp to be actuated by said lever simultaneously with the actuation of said arm clamp, said means including an arm on said shaft, a member mounted on said head and adapted to be shifted by the movement of said lever, a disconnectible connection between said member and said arm adapted to be rendered effective by the initial clamp clos-: ing movement of said lever and rendered ineffective by both the final clamping and unclamping movements thereof; and a second lever carried by said tool-head for actuating said head clamp in both the clamped and unclamped position of said arm clamp.

5. In a radial drill having a support, an arm supported thereby and a tool-head mounted on said arm, means including a first manually actuable lever carried by said tool-head for clamping said arm to said support; means including a rotatable shaft journaled in said tool-head and clamp devices actuated thereby for clamping said head to said arm; a second manually actuable lever connected with said shaft to actuate said head clamps independent of the arm clamp; means to establish an operative connection between said first lever and said shaft for simultaneously actuating the head clamp and the arm clamp by said first lever, said means comprising a an arm on said shaft, a member operatively connected with said first lever and adapted to be shifted thereby, cam actuated means to establish an operative connection between said member and said arm during initial movement of said first lever in both its clamp closing and clamp opening movements; and means operative at the completion of said movements to break said connection.

6. In a radial drill as set forth in the preceding claim in which the connection between the arm-clamping lever and the head-clamping shaft comprises an arm on said shaft, a stud carried by said arm; an endwise movable link connected at one end with the arm-clamping lever and having its other end slidably mounted in a bracket carried by the tool-head, said link being free to be shifted laterally and having therein an aperture adapted to receive said stud, said link also being provided with cam surfaces engaged by a spring pressed element to shift said link laterally thereby to cause said stud to engage said aperture during clamp-actuating movements of said lever, and other cam means for shifting the link to disengage said stud from said aperture at the completion of said movements.

'7. In a radial drill having a column, an arm supported thereby and a tool-head mounted on said arm, means including a first manually actuable lever carried by said tool-head for clamping said arm to said column; means including a rotatable shaft journaled in said tool-head and a clamp device actuated thereby for clamping said head to said arm; a second manually actuable lever connected with said shaft to actuate said head clamp independently of the arm clamp; means to establish an operative connection between said first lever and said shaft for simultaneously actuating the head clamp and the arm clamp by said first lever; and means operative at the completion of the clamping movement of said first lever to break said connection thereafter to leave said head clamp under the influence of said second lever.

H. HENRY SUNDERMANN, Executor of the Last Will and Testament of David C. Klausmeyer, Deceased.

AUGUSTUS M. SOSA. 

